Microbends in multimode optical fibers are shown to lead to focal ratio degradation which compromises fiber fed spectrograph design and performance. By propagating specific vortex mode patterns through multimode fibers containing a single controlled microbend the mechanisms for FRD can be understood. For example, we see both experimentally and through ray tracing analysis that a microbend can produce spiral patterns in the far-field. These patterns are potentially useful tools for diagnosing termination problems in fiber assemblies. For example, by analyzing the spiral patterns produced by a single microbend it is possible to determine the location of a microbend hidden in the fiber termination.
|Title of host publication||Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III|
|Editors||Ramón Navarro, Roland Geyl|
|Place of Publication||Bellingham, Washington|
|Number of pages||8|
|Publication status||Published - 10 Jul 2018|
|Event||Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018 - Austin, United States|
Duration: 10 Jun 2018 → 15 Jun 2018
|Name||Proceedings of SPIE|
|Conference||Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III 2018|
|Period||10/06/18 → 15/06/18|
Bibliographical noteCopyright 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
- Focal ratio degradation
- Optical fibers
- Radial velocity
- Vortex beams